Method For The Pressure Regulation In A Weaving Machine And Weaving Machine With A Pressure Regulating System

ABSTRACT

A method for the pressure regulation in a weaving machine ( 1 ) is presented, in particular in an air jet weaving machine having a pressure regulating system ( 10 ) and a weft insertion system for the insertion of a plurality of different weft threads ( 2, 2 ′). In the weft insertion system a thread store ( 2   a   , 2   b   , 2   a   ′, 2   b ′) and a main nozzle ( 3, 3 ′) is provided for each different weft thread, with the main nozzle drawing off the respective weft thread from the thread store and accelerating it during the insertion. In addition, there is provided in the pressure regulating system, for a group of main nozzles together, a pressure regulator ( 20 ) with a pressure sensor ( 21 ), a multi-way valve ( 22 ) and a regulator ( 23 ) arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve, and the pressure regulator ( 20 ) is coupled for the insertion of a weft thread to the main nozzle ( 3, 3 ′) of the group corresponding to it.

The invention relates to a method for the pressure regulation in a weaving machine, in particular a jet weaving machine in accordance with the preamble of claim 1 and to a weaving machine, in particular a jet weaving machine having a pressure regulating system in accordance with the preamble of claim 5.

In a weaving machine, in particular in a jet weaving machine, a weft thread drawn off from a thread store is accelerated by a main nozzle and, if required, additionally by a tandem nozzle and inserted into a shed in which it is transported further by so-called auxiliary or relay nozzles. In the simplest case the main nozzle and, if required, the tandem nozzle, are respectively subjected to a fixedly set pressure and for a fixed blowing period. The fixed setting of pressure and blowing time results however in a comparatively high consumption of pressure medium because the setting always has to be sufficiently high that the weft insertion time can be maintained under all circumstances. Accordingly, apparatuses and methods for pressure regulation have been developed in order to reduce the consumption of pressure medium. For example an apparatus and a method for the pressure regulation of main nozzles acting with compressed air is described in EP 494 050 A1 in which the weft insertion time is measured and the pressure applied to the main nozzle is regulated on the basis of the measured weft insertion time.

If the fabric to be formed contains a plurality of different weft threads, for example weft threads with different thickness, colour or texture then, in customary weaving machines, a thread store, a main nozzle and a pressure or flow regulator were respectively provided for each of these different weft threads with which the pressure or the through-flow to which the respective main nozzle is subjected can be set. In this manner it is possible to adapt the pressure or through-flow to the relevant weft thread. A regulation which regulates the pressure for the respective main nozzles and tandem nozzles on the basis of the measured weft insertion time is normally dispensed with, since for each different weft thread a controllable pressure regulator for the respective main nozzle and mainly a further controllable pressure regulator for the respective tandem nozzle is required and the cost and complexity for the controllable pressure regulators, the control and the connection is comparatively high.

The object of the present invention is to make available both a method for the pressure regulation in a weaving machine, in particular in a jet weaving machine and also a weaving machine, in particular jet weaving machine having a pressure regulating system which, in comparison to customary methods and weaving machines have a comparatively low degree of complexity and cost for the pressure regulation of the main nozzles and if required the tandem nozzles, which enable a regulation of the pressure applied to the main nozzles and, if required, to the tandem nozzles in dependence on the insertion time or the speed of the respective weft thread and which can make do with comparatively cost-favourable components which are obtainable as production items.

This object is satisfied by the method for pressure regulation defined in claim 1 and by the weaving machine with a pressure regulating system defined in claim 5.

In the method of the invention for pressure regulation in a weaving machine, in particular in an air jet weaving machine having a pressure regulating system and a weft insertion system for the insertion of a plurality of different weft threads, a thread store and a main nozzle is provided in the weft insertion system for each different weft thread, with the main nozzle drawing off the respective weft thread from the thread store during the insertion and accelerating it. In addition, a the pressure regulator with a pressure sensor, a multi-way valve and a regulator arranged separate from it is provided in the pressure regulating system for a group of main nozzles together, with the regulator being connected to the pressure sensor and to the multi-way valve, and the pressure regulator is coupled for the insertion of a weft thread with the main nozzle of the group corresponding to it.

In an advantageous variant one or more tandem nozzles are additionally provided in the weft insertion system for each different weft thread. Furthermore, a pressure regulator with a pressure sensor, a multi-way valve and a regulator arranged separate from it is provided in the pressure regulation system for a group of tandem nozzles together, with the regulator being connected to the pressure sensor and to the multi-way valve, and the pressure regulator is coupled for the insertion of a weft thread to the tandem nozzle or to the tandem nozzles of the group corresponding to it.

In a further advantageous variant a pressure regulator with a pressure sensor, a multi-way valve and a regulator arranged separate from it is provided in the pressure regulating system for all main nozzles together and/or for all tandem nozzles together respectively, with the regulator being connected to the pressure sensor and to the multi-way valve, and the respective pressure regulator is coupled for the insertion of a weft thread to the main nozzle or to the tandem nozzle or tandem nozzles corresponding to it.

In an advantageous embodiment, one or more weft sensors and a regulating unit are additionally provided in the pressure regulating system, with the regulating unit being connected to the weft thread sensors and to the pressure regulator or regulators, and the insertion time and the speed of insertion of the different weft threads is detected by means of the weft thread sensors. Furthermore, for each weft thread, the pressure applied to the main nozzle and/or tandem nozzle/tandem nozzles associated with the relevant weft thread is set and/or regulated in dependence on the insertion time and/or the insertion speed detected.

The weaving machine in accordance with the invention, in particular a jet weaving machine with a pressure regulating system includes a weft insertion system for the insertion of a plurality of different weft threads, with the weft insertion system containing a thread store and a main nozzle for each different weft thread in order to draw off a respective weft thread from the thread store during the insertion and to accelerate it and with the weft insertion system being connected to the pressure regulating system. The pressure regulating system of the weaving machine contains a pressure regulator with a pressure sensor, a multi-way valve and a regulator arranged separate from it for a group of main nozzles together, with the regulator being connected to the pressure sensor and to the multi-way valve and with the pressure regulator being able to be coupled to the individual main nozzles of the group.

In an advantageous variant the weft insertion system additionally includes one or more tandem nozzles for each different weft thread, with the pressure regulation system respectively containing for a group of tandem nozzles a pressure regulator with a pressure sensor, a multi-way valve and a regulator arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and with the pressure regulator being able to be coupled to the individual tandem nozzle of the group.

In a further advantageous variant the pressure regulating system respectively contains, for all main nozzles together and/or for all tandem nozzles together, a pressure regulator having a pressure sensor, a multi-way valve and a regulator arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and with the respective regulator being able to be coupled to the individual main nozzle and/or to the tandem nozzles.

In an advantageous embodiment the pressure regulating system additionally contains one or more weft thread sensors for the detection of the insertion time and/or insertion speed of the different weft threads and a regulating unit, with the regulating unit being connected to the weft thread sensors and to the pressure regulator or regulators in order to set and/or regulate for each weft thread the pressure applied to the main nozzle and/or tandem nozzle associated with the relevant weft thread in dependence on the detected insertion time and/or the insertion speed.

The pressure regulating system advantageously contains for each main nozzle and/or tandem nozzle a respective valve by which the relevant main nozzle or tandem nozzle can be coupled to the respective pressure regulator.

If required the pressure regulating system can additionally contain a pressure line and/or a pressure tank, which is connected to it if required to which the pressure regulator or pressure regulators are connected.

The method in accordance with the invention for the pressure regulation in a weaving machine and the weaving machine in accordance with the invention with a pressure regulating system have the advantage that the cost and complexity for the pressure regulation can be reduced in comparison to customary methods and weaving machines in that the pressure regulators that are used enable a comparatively rapid pressure adaptation or reaction time thanks to the use of a multi-way valve as a setting member, so that in each case one pressure regulator is sufficient for a group of main nozzles and/or tandem nozzles. Moreover, the pressure regulators that are used enable a regulation of the pressure applied to the main nozzles and, if required, to the tandem nozzles, in dependence on the insertion time or the speed of the respective weft thread since, as already mentioned, they react comparatively quickly and the cost and complexity for such a regulation can be significantly reduced thanks to the lower number of pressure regulators that are required in comparison to the initially described prior art. The use of easily obtainable and cost-favourable standard components such as pressure sensors, multi-way valves and separately disposed regulators permits additional savings. Thus, by way of example, a plurality of regulators can be combined into a regulating unit into which the regulation of the pressure applied to the main nozzles and, if required, to the tandem nozzles, can be optionally integrated in dependence on the insertion time or speed of the respective weft thread. Moreover, the regulating unit can also be integrated into the weaving machine control.

The above description of embodiments merely serves as an example. Further advantageous embodiments can be seen from the dependent claims and the drawing. Moreover, in the context of the present invention, individual features from the described or shown embodiments or variants can also be combined with one another to form new embodiments.

The invention will be explained in more detail in the following with reference to an embodiment and to the drawing in which are shown:

FIG. 1 a perspective view of a customary jet weaving machine,

FIG. 2 a schematic illustration of an embodiment of a pressure regulating system of a weaving machine in accordance with the present invention,

FIG. 3 a schematic representation of a second embodiment of a pressure regulating system of a weaving machine in accordance with the present invention,

FIG. 4 a schematic illustration of a third embodiment of a pressure regulating system of a weaving machine in accordance with the present invention, and

FIG. 5 a schematic representation of a fourth embodiment of the pressure regulating system of the weaving machine in accordance with the present invention.

In the view of a customary jet weaving machine 1 shown in FIG. 1, such as for example an air jet weaving machine, the latter includes a weft insertion system for the insertion of a plurality of different weft threads 2, 2′ which contains in each case a thread store and a main nozzle 3, 3′ for each different weft thread in order to draw the respective weft thread from the thread store and accelerate it during the insertion. The thread stores 2 b, 2 b′ can in turn draw off the respective weft thread, for example as shown in FIG. 1, from a yarn spool 2 a, 2 a′. If required, the weft insertion system can additionally and respectively include one or more tandem nozzles 4, 4′ for each different weft thread in order to further accelerate the weft thread and to insert it into a shed of the jet weaving machine 1. Moreover, the weft insertion system typically contains a plurality of auxiliary or relay nozzles 5 which are arranged in the shed in order to transport the weft thread further in the shed and also, if required, a catching and holding device 6 which can, for example, include a capture nozzle and which is arranged at the catching side of the shed in order to hold the inserted weft thread. Furthermore, the jet weaving machine can, as shown in FIG. 1, optionally include shed forming members 7 for the formation of the shed and/or a reed 8 in order to beat up the inserted weft thread.

In addition the air jet weaving machine 1 includes a pressure regulating system 10 in order to supply the main nozzles 3, 3′ and, if required, the tandem nozzles 4, 4′ and/or the relay nozzles 5 with a pressure medium such as for example compressed air or water. The pressure regulating system 10 can for example, as shown in FIG. 1, be connected to a pressure line 11, which is for example connected to a pressure tank and/or a pressure source such as for example a compressor and/or to a control line 12 which typically stands in communication with the control of the jet weaving machine. Moreover, one or more pressure tanks 14, one or more pressure distributors 15 and also control valves (not shown in FIG. 1) can be provided in order to energize the relay nozzles 5 with pressure medium for the insertion of the weft thread. If required, the pressure regulating system 10 can additionally contain one or more weft thread sensors 13 for the detection of the time of insertion of the weft threads 2, 2′ and a regulating unit which is connected to the weft thread sensors and for example to the control valves of the relay nozzles in order, for example, to regulate the blowing time of the relay nozzles in dependence on the insertion time that is detected.

FIG. 2 shows a schematic representation of an embodiment of a pressure regulating system of a weaving machine in accordance with the present invention. The weaving machine, in particular a jet weaving machine, includes a weft insertion system for the insertion of a plurality of different weft threads and with the weft insertion system containing for each different weft thread a thread store and a main nozzle in order to draw off the respective weft thread from the thread store and to accelerate it during insertion and being connected to the pressure regulating system of the weaving machine. For a respective group of main nozzles 3, 3′, 3″, 3′″ together, the pressure regulating system contains a pressure regulator 20 with a pressure sensor 21, a multi-way valve 22, such as for example a 2/2 way valve or a 3/2 way valve and a regulator arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and with the pressure regulator being able to be coupled to the individual main nozzles of the group. The weft threads can for example be distinguished in colour, fineness, texture and material. The number of the different weft threads and thus the total number of main nozzles can lie, depending on the application, between 2 and 8 or 10 or more. The regulator 23 connected to the pressure sensor 21 and to the multi-way valve 22 is expediently designed as a controllable regulator, for example as an electronic impulse generator or an electronic pulse width regulator in order to optionally connect the pressure output of the multi-way valve which is to be regulated to the pressure inlet or to the pressure outlet.

In an advantageous variant the weft insertion system of the jet weaving machine additionally includes one or more tandem nozzles for each different weft thread, with the pressure regulating system respectively having, for a group of tandem nozzles together, a pressure regulator 20 with a pressure sensor 22, a multi-way valve 22 and a regulator 23 arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and with the pressure regulator being able to be coupled to the individual tandem nozzles of the group.

In a further advantageous variant the pressure regulating system respectively contains, for all the main nozzles 3, 3′, 3″, 3′″ together and/or for all tandem nozzles together, a pressure regulator 20 with a pressure sensor 21, a multi-way valve 22 and a regulator 23 arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and with the respective pressure regulator being able to be coupled to the individual main nozzles or tandem nozzles respectively.

In a further advantageous variant the pressure sensor 21 of the pressure regulator is built into or integrated into the multi-way valve 22 or the pressure sensor and the multi-way valve 22 form a common constructional unit.

In an advantageous embodiment the pressure regulating system additionally includes one or more weft thread sensors for the detection of the insertion duration and/or the insertion speed of the different weft threads and a regulating unit which is connected to the weft thread sensors and to the pressure regulator or pressure regulators 20, for example via a control line 23 a, in order to set and/or regulate for each weft thread the pressure applied to the main nozzle 3, 3′, 3″, 3′″ and/or tandem nozzle associated with the relevant weft thread in dependence on the detected insertion duration or insertion speed.

The pressure regulating system advantageously contains in addition a respective valve 17, 17′, 17″, 17′″ for each main nozzle and/or tandem nozzle by which the relevant main nozzle 3, 3′, 3″, 3′″ or tandem nozzle can be coupled to the respective pressure regulator 20. A pressure distributor 16 can be provided if required between the valves 17, 17′, 17″, 17′″ and the respective pressure regulator 20. If necessary the pressure regulation system can additionally contain a pressure line 11 with which the pressure regulator or pressure regulators 20 and in particular the pressure inlet of the respective multi-way valve 22 are connected. The pressure outlet of the respective multi-way valve 22 can for example be connected to a sound damper 24 in order to damp the sound level produced by the pressure regulator 20. This is in particular of advantage if, for example, compressed air is discharged to the environment.

FIG. 3 shows a schematic illustration of a second embodiment of a pressure regulating system for a weaving machine in accordance with the present invention. The weaving machine, in particular jet weaving machine includes a weft insertion system for the insertion of a plurality of different weft threads which contains, for each different weft thread, a thread store and a main nozzle in order to draw the respective weft thread off from the thread store during the insertion and to accelerate it and which is connected to the pressure regulating system of the weaving machine. The pressure regulating system respectively contains, for a group of main nozzles 3, 3′, 3″, 3′″ together, a pressure regulator 20 having a pressure sensor 21, a multi-way valve 22 and a regulator 23 arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and with the pressure regulator being able to be coupled to the individual main nozzles of the group.

The second embodiment that is shown in FIG. 3 is distinguished from the embodiment shown in FIG. 2 only in that an additional valve 19 is provided upstream of the pressure regulator 20 and in particular upstream of the pressure inlet of the multi-way valve 22 in order to interrupt the pressure supply. Having regard to the details for the layout of the weaving machine and in particular of the pressure regulating system and possible embodiments and variants reference is made to the above first embodiment above which was explained in the context of the description of FIG. 2.

The described pressure regulator 20 with the pressure sensor 21, a multi-way valve 22 and a regulator 23 which is arranged separate from it has the property that pressure medium is continually consumed in order to maintain the desired pressure, in that the regulator switches the multi-way valve to and fro between the pressure inlet and the pressure outlet at a specific cycle rate. If one, on the other hand, stops the multi-way valve in one of the two states then the pressure at the pressure outlet either rises to the pressure applied to the pressure inlet or sinks to the pressure at the pressure outlet, i.e. normally to the environmental pressure. The continuous consumption of pressure medium is particularly disturbing in weft insertion pauses. The additional valve 19 which is provided in the embodiment shown in FIG. 3 at the inlet of the pressure regulator has the advantage that the pressure supply can be interrupted so that, in weft insertion pauses with the pressure inlet of the multi-way valve open, the pressure at the pressure outlet is maintained over a longer period of time without pressure medium being consumed for this.

FIG. 4 shows a schematic representation of a third embodiment of a pressure regulating system of a weaving machine in accordance with the present invention. The weaving machine, in particular a jet weaving machine, includes a weft insertion system for the insertion of a plurality of different weft threads which contains a thread store and a main nozzle for each different weft thread in order to draw off the respective weft thread from the thread store during insertion and to accelerate it and which is connected to the pressure regulating system of the weaving machine. The pressure regulating system respectively contains, for a group of main nozzles 3, 3′, 3″, 3′″ together, a pressure regulator 20 with a pressure sensor 21, a multi-way valve 22 and a regulator arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and with the pressure regulator being able to be coupled to the individual main nozzles of the group.

The third embodiment which is shown in FIG. 4 is distinguished from the embodiment shown in FIG. 2 solely in that a pressure tank 18 and, if required, an additional pressure sensor 21′ is/are provided upstream of the pressure regulator 20 and in particular upstream of the pressure inlet of the multi-way valve 22. Having regard to details for the construction of the weaving machine and in particular of the pressure regulating system and to possible embodiments and variants reference is made to the first embodiment above, which was explained in connection with the description of FIG. 2.

The pressure tank 18 which is provided in the embodiment shown in FIG. 4 at the inlet side of the pressure regulator makes it possible to stabilize the pressure at the pressure inlet of the multi-way valve even with changing consumption of pressure medium and/or in the case of pressure sources which are not very constant. Naturally a plurality of pressure regulators, such as for example the respective pressure regulators for the main nozzles and for the tandem nozzles, can be connected to the same pressure tank. The additional pressure sensor 21′, which, if required, is arranged upstream of the pressure regulator and is advantageously connected to the regulator 23, permits the detection of the pressure in the compressed air supply so that the regulator 23 can react in timely manner to pressure changes in the compressed air supply.

FIG. 5 shows a schematic representation of a fourth embodiment of a pressure regulating system of a weaving machine in accordance with the present invention. The weaving machine, in particular a jet weaving machine includes a weft insertion system for the insertion of a plurality of different weft threads which contains a thread store and a main nozzle for each different weft thread in order to draw off the respective weft thread from the thread store during insertion and to accelerate it and which is connected to the pressure regulating system of the weaving machine. The pressure regulating system respectively contains for a group of main nozzles 3, 3′, 3″, 3′″ together a pressure regulator 20 having a pressure sensor 21, a multi-way valve 22 and a regulator 23 arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and with the pressure regulator being able to be coupled to the individual main nozzles of the group.

The fourth embodiment which is shown in FIG. 5 is distinguished from the embodiment shown in FIG. 2 only in that an additional valve 19 is provided upstream of the pressure regulator 20 and in particular upstream of the pressure inlet of the multi-way valve 22 and in that a pressure tank 18 and, if required, an additional pressure sensor 21′ are provided in front of the additional valve 19. Having regard to details of the construction of the weaving machine and in particular of the pressure regulating system and possible embodiments and variants reference is made to the first embodiment above, which was explained in the context of the description of FIG. 2.

The manner of operation and advantages of the additional valve 19, of the pressure tank 18 and, if required, of the additional pressure sensor 21′ which are provided in the embodiment shown in FIG. 5 have already been explained in the context of the above descriptions of the second embodiment shown in FIG. 3 and of the third embodiment shown in FIG. 4 so that at this point reference can be made to the corresponding descriptions.

An embodiment of a method in accordance with the invention for the pressure regulation in a weaving machine, in particular in a jet weaving machine having a pressure regulating system 10 and a weft insertion system for the insertion of a plurality of different weft threads 2, 2′ will be described in the following with reference to the FIGS. 1 to 5. In the named method a respective thread store 2 a, 2 a′, 2 b, 2 b′ and a main nozzle 3, 3′ is provided in the weft insertion system for each different weft thread, with the main nozzle drawing the respective weft thread from the thread store during the insertion and accelerating it. In addition there is provided in the pressure regulating system for a group of main nozzles 3, 3′ together a pressure regulator 20 having a pressure sensor 21, a multi-way valve 22 and a regulator 23 arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve, and the pressure regulator is coupled for the insertion of a weft thread with the main nozzle of the group corresponding to it, for example via a valve 17, 17′, 17″, 17′″.

In an advantageous variant of the method one or more tandem nozzles 4, 4′ are additionally provided in the weft insertion system for each different weft thread. Furthermore, there is provided in the pressure regulating system for a group of tandem nozzles together a pressure regulator 20 having a pressure sensor 21, a multi-way valve 22 and a regulator 23 arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve, and the pressure regulator is coupled for the insertion of the weft thread to the tandem nozzle or tandem nozzles of the group corresponding to it, for example via a valve 17, 17′, 17″, 17′″.

In a further advantageous variant of the method there is respectively provided in the pressure regulating system for all main nozzles 3, 3′ together and/or for all tandem nozzles 4, 4′ together a pressure regulator 20 having a pressure sensor 21, a multi-way valve 22 and a regulator 23 arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve, and the respective pressure regulator is coupled for the insertion of a weft thread to the main nozzle or tandem nozzle or tandem nozzles corresponding to it, for example via a valve 17, 17′, 17″, 17′″.

In an advantageous embodiment of the method there are additionally provided in the pressure regulating system one or more weft sensors 13 and a regulating unit which is not shown in the Figures, which is connected to the weft thread sensors and to the pressure regulator or regulators 20 and the insertion duration and/or the insertion speed of the different weft threads 2, 2′ is detected by means of the weft thread sensors. Furthermore, for each weft thread, the respective pressure to which the main nozzle and/or the tandem nozzle or tandem nozzles associated with the relevant weft thread are subjected is set and/or regulated in dependence on the detected insertion time and/or the speed of insertion, in particular in dependence on the insertion time and/or insertion speed detected for the relevant weft thread and/or for a weft thread inserted with the same main nozzle.

The above-described method for the pressure regulation in a weaving machine and the above-described weaving machine with a pressure regulating system have the advantage that they enable a comparatively rapid pressure adaptation, i.e. reaction time, so that, for example during a weft insertion, the respective pressure to which the corresponding main nozzle and tandem nozzle is subjected can be regulated for the actually inserted weft thread. Moreover, the described method and the described weaving machine enables savings, since in each case only one pressure regulator is required for a group of main nozzles or tandem nozzles, or for all main nozzles or tandem nozzles. The described pressure regulators have, moreover, the advantage that the regulators can be combined in one or more regulating units thanks to the separation provided in accordance with the arrangement between the regulators and the multi-way valves. 

1. A method for the pressure regulation in a weaving machine (1), in particular an air jet weaving machine having a pressure regulating system (10) and a weft insertion system for the insertion of a plurality of different weft threads (2, 2′) in which a thread store (2 a, 2 b, 2 a′, 2 b′) and a main nozzle (3, 3′) is provided for each different weft thread, with the main nozzle drawing off and accelerating the respective weft thread from the thread store during the insertion, characterized in that a pressure regulator (20) with a pressure sensor (21), a multi-way valve (22) and a regulator (23) arranged separate from this is provided in the pressure regulating system (10) for a group of main nozzles together, with the regulator being connected to the pressure sensor and to the multi-way valve and in that the pressure regulator (20) is coupled for the insertion of a weft thread to the main nozzle (3, 3′) of the group corresponding to it.
 2. A method in accordance with claim 1 wherein, in addition, one or more tandem nozzles (4, 4′) are provided in the weft insertion system for each different weft thread (2, 2′) and wherein a pressure regulator (20) having a pressure sensor (21), a multi-way valve (22) and a regulator (23) arranged separate from it is provided in the pressure regulating system (10) for a group of tandem nozzles together, with the regulator being connected to the pressure sensor and to the multi-way valve, and the pressure regulator is coupled for the insertion of a weft thread to the tandem nozzle or nozzles of the group corresponding to it.
 3. A method in accordance with claim 1, wherein a respective pressure regulator (20) having a pressure sensor (21), a multi-way valve (22) and a regulator (23) arranged separate from it is provided in the pressure regulating system for all main nozzles (3, 3′) together and/or for all tandem nozzles (4, 4′) together, with the regulator being connected to the pressure sensor and to the multi-way valve, and wherein the respective pressure regulator is coupled to the corresponding main nozzle and tandem nozzle or tandem nozzles for the insertion of a weft thread.
 4. A method in accordance with claim 1, wherein one or more weft sensors (13) and a regulating unit are additionally provided in the pressure regulating system with the regulating unit being connected to the weft thread sensors and the pressure regulator or regulators and wherein the insertion time and the speed of insertion of the different weft threads (2, 2′) is detected by means of the weft thread sensors and for each weft thread the pressure with which the main nozzle and/or tandem nozzle/tandem nozzles associated with the relevant weft thread are operated is set and/or regulated in dependence on the insertion time and/or the insertion speed detected.
 5. A weaving machine, in particular a jet weaving machine having a pressure regulating system and including a weft insertion system for the insertion of a plurality of different weft threads (2, 2′) which contains a thread store (2 a, 2 b, 2 a′, 2 b′) and a main nozzle (3, 3′) for each different weft thread, in order to draw off from the thread store and accelerate the respective weft thread during the insertion and which is connected to the pressure regulating system, characterized in that the pressure regulating system (10) contains a pressure regulator (20) with a pressure sensor (21), a multi-way valve (22) and a regulator (23) arranged separate from it for a group of main nozzles together, the regulator being connected to the pressure sensor and/or to the multi-way valve and in that the pressure regulator is able to be coupled to the individual main nozzles (3, 3′) of the group.
 6. A weaving machine in accordance with claim 5, wherein the weft insertion system additionally includes one or more tandem nozzles (4, 4′) for each different weft thread (2, 2′) and wherein the pressure regulating system contains a pressure regulator (20) with a pressure sensor (21), a multi-way valve (22) and a regulator (23) arranged separate from it for a group of tandem nozzles together, with the regulator being connected to the pressure sensor and to the multi-way valve and wherein the pressure regulator is able to be coupled for the insertion of a weft thread to the individual tandem nozzles of the group.
 7. A weaving machine in accordance with claim 5, wherein the pressure regulating system respectively contains for all main nozzles (3, 3′) together and/or for all tandem nozzles together a pressure regulator (20) with a pressure sensor (21), a multi-way valve (22) and a regulator (23) arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve and wherein the respective pressure regulator is able to be coupled to the individual main nozzles (3, 3′) and/or to the individual tandem nozzles (4, 4′).
 8. A weaving machine in accordance with claim 5, wherein the pressure regulating system additionally contains one or more weft thread sensors (13) for the detection of the insertion time and/or insertion speed of the various weft threads (2, 2′) and a regulating unit, with the regulating unit being connected to the weft thread sensors and to the pressure regulator or regulators in order to set and/or regulate for each weft thread the pressure which is applied to the corresponding main nozzle (3, 3′) and/or to the corresponding tandem nozzle (4, 4′) in dependence on the insertion time and/or the insertion speed detected.
 9. A weaving machine in accordance with claim 5, wherein the pressure regulating system additionally contains in each case for each main nozzle (3, 3′) and/or tandem nozzle (4, 4′) a valve (17, 17′) by which the relevant main nozzle or tandem nozzle can be coupled to the respective pressure regulator.
 10. A weaving machine in accordance with claim 5, wherein the pressure regulating system additionally contains a pressure line (11) and a pressure tank (18) connected to it to which the pressure regulator or regulators (20) are connected. 